JPS6327532B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an overhead camshaft (OHC) in which a camshaft is provided in a cylinder head.
This relates to a V-type engine.

(Prior art) Conventionally, in V-type engines,
As shown in Publication No. 114845, by shifting one bank with respect to the other bank in the axial direction of the crankshaft, a space is formed in front of the one bank and at the rear of the other bank. It is known that the overall shape of the engine can be made smaller by distributing and arranging engine accessories driven by a crankshaft in both spaces and attaching them to the cylinder block.

However, since a V-type engine with this type of structure is an overhead valve type, when applied to an OHC type engine, it is necessary to install a mounting hole for an engine accessory driven by a camshaft such as a distributor. It is necessary to open holes in the cylinder head cover and the cylinder head, and holes are formed in different parts of the cylinder head on both banks of a V-type engine, which becomes an obstacle when trying to standardize parts on both banks. There is.

Furthermore, if the above-mentioned hole is provided in the head cover provided on the cylinder head and the engine auxiliary equipment is attached to the head cover, the head cover must be strong enough to support the auxiliary equipment, making it difficult to reduce the weight of the head cover. It is.

(Object of the Invention) In view of the above-mentioned circumstances, the present invention aims to standardize the cylinder head components on both sides of the cylinder head cover so that the engine auxiliary equipment mounting part such as the distributor and the oil injection part are not formed on the head cover. At the same time, by utilizing the structure in which the cylinders of the first bank and the cylinders of the second bank are arranged offset in the axial direction of the crankshaft, the mounting part of the engine auxiliary equipment driven by the camshaft and the oil injection It is an object of the present invention to provide a V-type engine in which parts are arranged in symmetrical positions on both sides of the bank, thereby making parts common and reducing the weight of the head cover.

(Structure of the Invention) In the V-type engine of the present invention, the cylinder heads of both banks are extended from each head cover at one end where the cylinder is separated from the end face of each cylinder head, and each cylinder head of both sides is extended. It is characterized in that openings are provided at symmetrical positions in each bank, and the openings in one bank are used as engine auxiliary equipment mounting parts, and the openings in the other bank are used as oil injection parts.

In the above-mentioned cylinder head, if the support portion of the camshaft is provided with a cam cap, the extension portion of the cylinder head includes the cam cap. Further, the engine auxiliary equipment includes those driven by a camshaft, such as a distributor, a fuel pump, and an injection pump (diesel engine).

(Effects of the Invention) According to the present invention, the cylinder head in this portion is extended from the head cover by utilizing the dead space that is formed when the cylinders are disposed in the banks on both sides shifted in the axial direction of the crankshaft. By using the openings in this extension as the mounting part for engine auxiliary equipment in one bank and as the oil injection part in the other bank, it can be used as the mounting part for engine auxiliary equipment without increasing the overall length of the engine. The oil injection part can be formed, and the cylinder head components including the head cover can be made common to both banks, and the number of parts and costs can be reduced. In addition, since there is no need to attach engine auxiliary equipment to the head cover, the required strength of the head cover is reduced, and the head cover can be made thinner and made of plastic, making it smaller and lighter.It also has an improved aesthetic appearance and a floating structure. Noise reduction can be achieved by adopting Furthermore, the above extensions also serve as dead spaces for the cylinder blocks in each bank, ensuring an oil return path from the oil injection part to the oil pan, and also making it easy to form an oil return from the cylinder head. Provides good oil circulation.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic front view showing a 6-cylinder V-type engine in partial cross section, FIG. 2 is a schematic plan view thereof, and FIG. 3 is a sectional view of the first bank along line A-A in FIG.
FIG. 4 is a sectional view of the second bank taken along line B--B in FIG. 2. FIG.

The OHC type V-type engine 1 has first and second banks 2 and 3 arranged on the left and right in a V shape, and an oil pan 5 is attached to the lower surface of the cylinder block 4. A crankshaft 7 is provided in a crankcase 6 made up of the oil pan 5 and the lower part of the cylinder block 4.

Camshafts 10 and 11 are provided in the first and second cylinder heads 8 and 9 of the first and second banks 2 and 3, which are hermetically sealed to the upper surface of the cylinder block 4, respectively, and the camshafts 10 and 11 are connected to the crankshaft 7. The camshafts 10, 11 are connected to each other at their ends (front ends).
and the crankshaft 7 can rotate synchronously. That is, the timing pulleys 12 and 13 fixed to the ends of the camshafts 10 and 11
A timing belt 15 is wound around a crank pulley 14 fixed to an end of the crankshaft 7. 16, 17, and 18 are idlers.

The first bank 2 has even numbered cylinders,
, but the second bank 3 is formed with odd-numbered cylinders, , respectively, and the cylinders, , of the first bank 2 are spaced further from the end on the front side than the cylinders, , of the second bank 3. They are arranged offset in the axial direction of the crankshaft 7. Head covers 19 and 20 are provided on the upper surfaces of the cylinder heads 8 and 9 of the first and second banks 2 and 3, respectively.

The cylinder head 8 of the first bank 2 has a front part, that is, the part near the said end, and the cylinder head 9 of the second bank 3 has a rear part, that is, a part near the end opposite to the said end.
20 and are formed to extend from each other.

Extensions 8a and 9 of both cylinder heads 8 and 9
Opening holes 21 and 22 are provided at mutually symmetrical positions of a.
is provided. The cylinder heads 8, 9 and head covers 19, 20 are connected to the banks 2 on both sides,
As is clear from FIG. 2, these members are arranged and installed in a state where they are rotated by 180 degrees with respect to each other, and the openings 21 and 22 of the extension parts 8a and 9a are also the same. They are arranged in a positional relationship of , and when viewed from the top, they are point symmetrical with respect to the center of the engine.

Extension 8a of cylinder head 8 of first bank 2
An opening 21 is formed in the engine auxiliary equipment mounting part 23, and as shown in FIG. A distributor 24 (engine accessory) is attached through the hole 21. A worm wheel 24b is fixed to the lower end of the rotating shaft 24a of the distributor 24, and this worm wheel 24b meshes with a worm gear 10b provided on the camshaft 10, whereby the rotational driving force of the camshaft 10 drives the distributor. 24 is adapted to be rotated.

That is, the large diameter portion 10a of the camshaft 10 is rotatably supported by the bearing portion 8b of the cylinder head 8 between each cylinder, and the intake or exhaust cam portion 10c is connected to an intake valve or an exhaust valve. One end of the rocker arm 26 is in contact with it. The timing pulley 1 is attached to one end (front end) of the camshaft 10.
2 is fixed, and the inside of this end is the cylinder head 8.
The worm gear 10b is formed in this portion, passing through the internal space of the extension portion 8a.

Further, an internal space 27 in the extension part 8a of the cylinder head 8 of the first bank 2, through which the camshaft 10 passes, has an upper part communicating with the opening 21, and a lower part communicating with the cylinder block 4 from the cylinder head 8. The oil return passage 28 and the upper space formed by the upper part of the cylinder head 8 and the head cover 19 and in which the rocker arm 26 etc. are installed are connected through a communication hole. 29 (see FIG. 1), and a part of the oil in the space is returned to the oil pan 5 from the communication hole 29 through the oil return passage 28.

On the other hand, the cylinder head 9 in the second bank 3
The opening 22 of the extension part 9a is formed in the oil injection part 30, and as shown in FIG. A filler cap 32 is removably screwed into the tank, and oil is injected by opening the filler cap 32.

The camshaft 11 of the second bank 3 has its large diameter portion 11a rotatably supported by a bearing portion 9b of the cylinder head 9 between each cylinder, and has an intake valve or an exhaust valve on its intake or exhaust cam portion 11c. Rotskar arm 2 linked to
6 is in contact with one end. The timing pulley 13 is fixed to one end (front end) of the camshaft 11, the rear end does not protrude into the extension 9a of the cylinder head 9, and the through hole of the cylinder head 9 at the rear end is It is closed by a sealing plug 33.

Further, the internal space 34 of the extension part 9a of the cylinder head 9 of the second bank 3 has an upper part that is connected to the opening 2.
2 communicates with an oil injection hole opened and closed by a filler cap 32, while the lower part communicates from this cylinder head 9 with an oil return passage 35 formed along the rear end surface of the cylinder block 4, which is connected to the oil pan 5. Oil injection is performed. Further, this internal space 34 is communicated with the upper space of the cylinder head 9 through a communication hole 40 which is opened similarly to the communication hole 29.

In addition, in FIGS. 3 and 4, 36 is a combustion chamber of each cylinder, 37 is a piston, and 38 is a combustion chamber of each cylinder.
39 is a cooling water passage, and 39 is a timing belt case.

With the above-described structure, in the OHC type V-type engine 1, the cylinders in the front end of the first bank 2 and the first The dead space behind the cylinders in the second bank 3 is effectively used to locate the engine auxiliary equipment mounting part 23 and the oil injection part 30, so the overall length of the engine 1 is not increased and the engine 1 remains compact. Further, due to their positional relationship, the cylinder heads 8, 9 and the head covers 19, 20 can be shared.

In particular, in the above embodiment, the engine auxiliary equipment mounting part 23 is provided on the extension part 8a of the cylinder head 8 of the first bank 2, which is formed on the front end side of the camshaft 10 where the timing pulley 12 is fixed to the tip of the camshaft 10. It is advantageous as a driving part of the tributator 24, and since the oil injection part 30 is formed in the extension part 9a formed on the rear end side of the cylinder head 9 of the second bank 3, the oil injection operation is easy to perform. be. Furthermore, since each of the extensions 8a and 9a is a dead space for each bank 2 and 3, it is possible to form large oil return passages 28 and 35 that communicate with the oil pan 5 from each cylinder head 8 and 9 to the cylinder block 4. This allows for easy oil injection and oil return. However, the installation positions of the engine auxiliary equipment mounting part 23 and the oil injection part 30 are opposite to those in the above embodiment, in case the auxiliary equipment to be installed is different or for reasons such as the relationship with other auxiliary equipment. The oil injection part 30 is connected to the engine auxiliary equipment mounting part 2 in the second bank 3.
3 may be installed.

In the above embodiment, the cylinder heads 8 and 9 are formed of a single member, and the camshaft 1
0 and 11 are supported by bearing parts 8b and 9b which are opened through the cylinder heads 8 and 9.
It consists of two parts that are vertically divided at the part 9b, that is, the upper half of the so-called cam cap to which the head covers 19 and 20 are attached, and the lower half of the cylinder head that is attached to the cylinder block 4, and these are fastened together to form the camshaft 10, 11 bearing parts may be formed. In this structure,
The extensions 8a, 9a of the cylinder heads 8, 9 are comprised of a lower half part that is integral with the cylinder head and the cam cap, and it is preferable that openings 21, 22 be provided in the cam cap part.
With this structure, it is possible to share the left and right banks of the cylinder head, cam cap, and head cover.

It goes without saying that the present invention can also be applied to OHC multi-cylinder V-type engines other than six cylinders.

[Brief explanation of drawings]

FIG. 1 is a schematic front view partially showing a 6-cylinder V-type engine in one embodiment of the present invention, and FIG.
The figure is a schematic plan view, Figure 3 is a sectional view of the first bank along line A-A in Figure 2, and Figure 4 is B in Figure 2.
It is a sectional view of the second bank along line -B. 1... V-type engine, 2... 1st bank, 3...
...Second bank, 4...Cylinder block, 7...
Crankshaft, 8, 9... cylinder head,
10, 11...Camshaft, 15...Timing belt, 19,20...Head cover, 21,
22...Opening hole, 23...Engine auxiliary equipment mounting part, 2
4...distributor, 30...oil injection section, 32...filler cap.

Claims (1)

[Claims] 1 A camshaft is provided in each of the cylinder heads of the first and second banks, and the camshaft is connected to the crankshaft for synchronous rotation at their ends, and the cylinders of the first bank are arranged at the ends of the cylinders of the second bank. In a V-type engine that is disposed offset in the axial direction of the crankshaft so as to be separated from the cylinder head of the camshaft, head covers are provided on the cylinder heads of the first and second banks, respectively, and the cylinder heads of the first bank are located on the cylinder heads of the camshaft. A portion near the end of the cylinder head and a portion near the end opposite to the end of the camshaft of the second bank are extended from the respective head covers, and the cylinder heads of the second bank are extended from the respective head covers.
Openings are provided at mutually symmetrical positions in each extension of the cylinder head of the second bank, and one of the openings is used as an engine auxiliary equipment mounting part, the other as an oil injection part, and a filler cap is provided in the oil injection part. A V-type engine characterized by being removably attached.